I cannot replicate this issue with the same version of svn and libneon27. However, there is a related bug report over at Debian. From their discussion it seems that libneon 0.29.3-2 should have fixed the problem. It's possible there has been a regression, but considering multiple other users cannot replicate your problem with the latest version of the package I feel like this is relatively unlikely.

There is a workaround suggested on the Debian bug tracker. Try editing ~/.subversion/servers and adding the line:

http-library=serf

To the end of the file. If this does not correct your issue it becomes even more unlikely that libneon has anything to do with your specific issue.